Ruler attachment.



V. A. RUSSO.

RULER ATTACHMENT.

APPLICATION FILED AUG.8, 1913.

Patented Mar. 24, 191L VZ/yz'Z ARI/6550 VIRGIL A. RUSSO, OF ALLENTOWN, PENNSYLVANIA.

RULER ATTACHMENT.

Specification of Letters Patent.

Patented Mar. 24,1914.

Application filed August 8, 1913. Serial No. 783,805.

To all whom it may concern Be it known that I, VIReIL A. Russo, a subject of the King of Italy, residing at Allentown in the county of Lehigh and State of ennsylvania, have invented new and useful Improvements in Ruler Attachments, of which the following is a specifi cation.

An object of the invention is to provide an attachment for rulers whereby the units of measure on the attachment can be related to and compared with the units of measure on the ruler, and whereby the length of the ruler with respect to the drawing of lines can be increased relatively to the length of the body of the ruler.

The invention embodies, among other features, the provision of a simple device preferably adapted for sliding engagement with the ruler and which is adapted to have graduations in the metric system or some other unit of measure thereon so that the units of measure on the attachment can be compared with and related to the units of measure on the body of the ruler.

The invention still further comprehends an attachment for use in connection with a ruler and which, by means of a second similar attachment in the nature of an extension, can be connected to the first attachment so that the ruler can be employed for drawing lines or measuring lines or figures of greater length or size than the length of the ruler.

In the further disclosure of the invention reference is to be had to the accom anying drawings, constitutin a part 0 this specification, in which similar characters of reference denote corresponding parts in all the views, and in which:

Figure 1 is a perspectiveview of a ruler showing my attachment thereon; Fig. 2 is a vertical transverse sectional View taken on the line 2-2 adjacent one end of the ruler as shown in Fig. 1; Fig. 3 is a vertical transverse sectional view taken on the line 3-3 adjacent the other end of the ruler; Fig. at is a fragmentary perspective view of the ruler having my device thereon, and showing an extension connected thereto; and Fig. 5 is a vertical transverse sectional view taken through the end of the attachment carrying the extension.

Referring more particularly to the views, I disclose a ruler 10, preferably of the well known triangular form and including a ruler body 11 having relatively inclined longitudinal faces 12 terminating in the usual straight edges 13, with recesses 14 formed on the ruler body as shown, this being the usual construction of the well known triangular ruler or scale.

A member 15, preferably made of a light sheet metal or celluloid, is adapted for use in connection with the triangular ruler 10 and consists of a single piece of strip-like material 16 bent longitudinally at its medial portion to provide diverging sides 17. terminating in inwardly bent gripping members 18 extending longitudinally of the sides 17 as shown, the said gripping members 18 at one end of the member 15, however, being cut away to form a seat 19 for a purpose that will be hereinafter more fully disclosed. The faces 12 of the ruler 10 preferably have a series of graduations 2O thereon, indicating the usual linear measure, and the member 15 is also provided with graduations 21 preferably indicating the metric system or some other linear measure in some way related to or comparable with the linear measure indicated by the graduations 20 of the ruler 10.

Now referring to Fig. 1 it will be appar- 7 eat that the member 15 can be readily arranged in slidin engagement with one. of the faces 12 as s own, with the sides 17 of the member covering the tapering sides of the face 12 to which the member 18 applied and the gripping members 18 of the member extending into the recesses 14, thus holding the member against transverse movement on the ruler without, however, preventing the member from being slid into or out of engagement with the ruler. Now it will be ap parent that when the member is applied to the ruler as mentioned, the graduations 21 of the member can be related or compared with the graduations 20 on the ruler and thus a convenient mode of readily converting the length of a line or size of a figure from inches to the unit of measurement known as the metric system, is provided.

As mentioned heretofore, one end of the member 15 constitutes a seat 19 and an extension 22, similar in every respect to the member 15, is provided and adapted for sliding engagement with the member at that end of the member having the seat 19 there:

on so that one end of the extension 22 can be slid on to and over the seat 19, thus materially increasing the length of the ruler so the computed. L 1 v 1, It will be readily understood that'my attachment provides a dew ice' which Will-C011 stitute an efficient-advertising medium, partieularly; in yiewi of the fact that the at;;;

tachment can be cheaply manufactured and Will be preferably stampedfroih aluminum or some other cheap and light material. -1-Iav ;g"thuS-' dseribed my invention,' I

claini s new articlebfmanufacture, a ruler faeh @nt for use on I rulerbodyfsaid body hziying longitudinal faces inclined "to each other and haying a longitudinal" re ess g iteri than th lc'ai? pacity of the ruler y 1 can be easily 7 a member bent along its medial longitudinal portion tosprovide inclined sides terminating in inwardly bent gripping members, the said; attaehment being adapted for sliding engagement with the body of the ruler to eoyer the flat faces thereof and havingthe gripping members extending into 'the rfe cesses=ormweay-er the ruler. E In testimony whereof I aflix my signature in presence of twofwitnesses'. 3 1w VI IL var-ee s I -Fif A I 

